Synthesis of (±)-phthalascidin 650 analogue: new synthetic route to (±)-phthalascidin 622
作者:Christian R. Razafindrabe、Sylvain Aubry、Benjamin Bourdon、Marta Andriantsiferana、Stéphane Pellet-Rostaing、Marc Lemaire
DOI:10.1016/j.tet.2010.08.053
日期:2010.11
synthesis of functionalized phenolic α-amino-alcohol (±)-13 as synthetic precursor of the catechol tetrahydroisoquinoline structure of phthalascidin 650 is disclosed. Starting from 3-methylcatechol 5, eight steps of synthesis give rise to the synthesis of phenolic α-amino-alcohol (±)-13 in 27% overall yield. This synthetic strategy involves the elaboration of fully functionalized aromatic aldehyde 8 and its
公开了作为邻苯二酚650的邻苯二酚四氢异喹啉结构的合成前体的官能化酚类α-氨基醇(±)-13的合成。从3-甲基邻苯二酚5开始,八个合成步骤以27%的总收率合成了酚类α-氨基醇(±)-13。该合成策略涉及通过Knoevenagel缩合,完全还原硝基烯酮和酯官能团以及对苄基保护基进行氢解,对完全官能化的芳族醛8进行精制并将其转化为酚类α-氨基醇(±)-13。五环(±)-18在另外四个步骤后获得。酚α氨基醇之间的的Pictet-格勒环化(±) - 13和ñ -保护的α氨基醛4允许获得(1,3') -双-四氢异喹啉14与Ñ甲基化的和Ñ -Fmoc删除。最后一步是用于分子内缩合的Swern氧化法。